Clock

Clock

Any instrument other than a watch for measuring or indicating time, especially a mechanical or electronic device having a numbered dial and moving hands or a digital display.

Industry: Chronometry

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Clock

royal pendulum

Chronometry; Clock

The verge escapement, being virtually the only one known when the pendulum was introduced, calls for a large pendulum arc, unless gearing is introduced between the escapement and pendulum, or the ...

An ingenious tool or engine for re-cutting or re-shaping wheel teeth. It is also sometimes called a 'topping tool', and with it a wheel can be reduced in diameter or corrected if not perfectly round, ...

round gothic clock

Chronometry; Clock

The earliest form of American Gothic case design was conceived by Elias Ingraham at Bristol, Connecticut, c. 1840. Subsequently copied and made in large quantities by other firms, it was usually ...

rotten stone

Chronometry; Clock

A natural friable stone, resulting from the decomposition of a siliceous limestone, which is a powerful abrasive. It is obtained either in crushed form, when it is mixed with oil to form a polishing ...

rotating pendulum

Chronometry; Clock

A feature found on both keywound and quartz (battery) anniversary clocks. Characterized by decorative balls in crystal or metal finish.

rope line

Chronometry; Clock

Rope is often used to drive early lantern-frame clocks and has a special open weave which is not easily damaged by the spiked pulley. Clock rope is still available in various thicknesses.

Roman striking

Chronometry; Clock

Joseph Knibb designed clocks of long-running duration, and to reduce the power requirements of the striking train, he devised a system of striking which utilized one bell for the Roman numeral I and ...